Light Intensity's Effect on Photosynthesis Essay

Light Intensity's Effect on Photosynthesis Essay

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Light Intensity's Effect on Photosynthesis


Aim : To find out how light intensity will affect the rate of
photosynthesis in a piece of Canadian Pondweed.

Prediction : I predict that as I increase the distance between the
light source and the Canadian Pondweed (reducing the light intensity),
the volume of oxygen produced within the time limit (the measure of
the rate of photosynthesis) will decrease. This will happen because as
the light source is moved further away, less light rays will reach the
surface of the Pondweed, shown by this diagram;

[IMAGE]

[IMAGE]




[IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] Light
source

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[IMAGE]

[IMAGE]




Light rays Pondweed Light rays Light source

Pondweed

This will mean that less light (particles or waves) will go through
the clear Cuticle and upper Epidermis and reach the palisade layer.
This means that less light will reach each cell on average, and as
light is needed for photosynthesis to make the water and carbon
dioxide react together (making it a limiting factor) and so less light
means less water and carbon dioxide is reacted together in the time,
therefore there will be a decreased rate of photosynthesis, and less
oxygen produced will be produced as a by-product of the photosynthesis
reaction.

[IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] I know that photosynthesis
will take place in the plant as there is all the factors needed for
photosynthesis available and present (water, carbon dioxide,
chlorophyll, and light) to the plant and therefore according to the
photos...


... middle of paper ...


...ble overall picture of
whether light intensity affects the rate of photosynthesis. I could
have extended the range on the distance axis so that I could find out
how this pattern evolves at the extremes of the axis and also do
sections of the range in more detail e.g. more dense results every 1mm
at the small end of the axis to see a more reliable pattern. I could
then conclude each part of the line of best fit in more detail and
explain the different stages of the experiment. I could have looked at
all the other limiting factors, maybe in the same experiment so I
could see the separate relationships and conclude which factor affects
photosynthesis more. Finally I could investigate the precise
mathematical relationship between these two factors using an equation
of the line of best fit and a Spearman's Rank calculation.

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